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The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
The Theory and Practice of Surveying: Containing All the Instructions ... - Σελίδα 45
των Robert Gibson - 1821 - 544 σελίδες
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## A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - 1818 - 168 σελίδες
...Centre ; and it divides the Circle into two equal parts, called Semicircles ; as AB or DE. Fig 5. 14. The Circumference of every Circle is supposed to be...equal parts, called Minutes ; and each Minute into 60 equal parts, called Seconds ; and these into Thirds, &c. Note. Since all Circles are divided into...

## A Treatise on Practical Surveying: Which is Demonstrated from Its First ...

Robert Gibson - 1818 - 478 σελίδες
...about circles, be supposed to be divided into some assigned number of equal parts. 2. The periphery of every circle is supposed to be divided into 360...equal parts, called minutes ; and each minute, into 60 equal parts, called seconds ; &c. 3. Any part of the periphery, is calledlan arch ; and is the measure...

## A Course of Mathematics: For the Use of Academies, as Well as Private Tuition

Charles Hutton - 1818
...the middle. Thus the angle contained by the lines BA and 3D is called the angle BAC BAD or DAB. 67. The circumference of every circle is supposed to be...equal parts, called Degrees : and each degree into 60 Minutes, each minute into 60 Seconds, and so on. Hence a semicircle contains 180 degrees, and a quadrant...

## Geometrical Problems Deducible from the First Six Books of Euclid, Arranged ...

Miles Bland - 1819 - 377 σελίδες
...unanimously agreed to divide the circumference of the circle into 36o equal parts called Degrees ; each degree into 60 equal parts called Minutes; and each minute into 60 equal parts called Seconds, &c. This method appeared to the Greek Geometers to afford some facilities...

## Geometrical Problems Deducible from the First Six Books of Euclid, Arranged ...

Miles Bland - 1819 - 377 σελίδες
...unanimously agreed to divide the circumference of the circle into 36o equal parts called Degrees ; each degree into 60 equal parts called Minutes ; and each minute into 60 equal parts called Seconds, &c. This method appeared to the Greek Geometers to afford some facilities...

## British Encyclopedia: Or, Dictionary of Arts and Sciences ..., Τόμος 3

William Nicholson - 1819
...otherwise called a periphery ; the boundary of a right lined figure being expressed by the term perimeter. The circumference of every circle is supposed to be divided into 360 degrees. The angle at the circumference of a circle is double that at the centre. For the ratio of...

## Hawney's Complete Measurer: Or, The Whole Art of Measuring. Being a Plain ...

William Hawney - 1820 - 312 σελίδες
...thus the arch I)E is the measure of the angle DBE aud the arch GH is the measure of the angle ABC. 1*. The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes : and each minute into 60 equal parts, called seconds....

## A Treatise of Algebra: Wherein the Principles are Demonstrated ... To which ...

Thomas Simpson - 1821 - 408 σελίδες
...and about the circle, be supposed divided into some assigned number of equal parts. 2. The periphery of every circle is supposed to be divided into 360...equal parts, called minutes, and each minute into 60 equal parts, called seconds, or second minutes, <Jc. Any part of the periphery is called an arch,...

## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid, Robert Simson - 1821 - 516 σελίδες
...arch AC is called the measure of the angle ABC. II. The circumference of a circle is supposed to lie divided into 360 equal parts called degrees; and each...equal ' ^ parts called minutes, and each minute into 60 equal parts called seconds, &c. And as many degrees, minutes, seconds, &c. as are contained in any...

## An introduction to geography and astronomy, by the use of the globes and ...

...the centre. / 1. A less circle divides a globe into two unequal parts. Every circle, great or small, is supposed to be divided into 360 equal parts, called degrees; and every degree is subdivided into 60 minutes. Degrees are marked °, and minutes'. Thus,—4 deg. 15...